Booster seat



FIG. 1 is a perspective view of the top, front and right side of a booster seat showing my new design;

FIG. 2 is a left-side elevational view thereof, the right side being substantially a mirror image thereof;

FIG. 3 is a rear elevational view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a booster seat, substantially as shown and described. 